Some of the strangest sounds in scifi movies and television come out of equally strange musical…
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She explains:

My fellow lab mate, Tatsuhiko Itohara, created a program for HRP-2 to follow his hand while playing the guitar. By watching and listening to the beat, HRP-2 can sync to the sound of an acoustic guitar!

You can also check out her other robot playing some more familiar tunes on the theremin (via Robot Dreams).